The Kolcraft Sleepy Little One Crib Mattress keeps your infant or toddler comfortable for years. Made by the family-owned and operated Kolcraft Enterprises, the leader in crib mattress design and manufacturing in the USA. Our American-made steel coils are strong, durable and create a mattress that will last for years of use as your newborn grows into a toddler. The 80 steel coils are durability tested and surrounded with a protective cushioning that offers excellent comfort. A waterproof crib mattress is essential for a sanitary sleeping surface. Our PermaDri waterproof cover wipes clean with a damp cloth, baby wipe or mild soap and water. Our innovative cover design features an airflow pocket that allows the mattress to breathe. Even more, you can feel confident that this crib mattress has been tested beyond the standard crib mattress tests. It is GREENGUARD GOLD Certified, a strict air quality standard designed for products used with children, especially our sensitive little ones. It also meets Washington State's Chemicals of High Concern to Children standards, as well as the CPSIA lead and phthalate tests to help ensure a healthier sleeping environment. The Kolcraft Sleepy Little One Crib Mattress ASTM crib mattress standards including proper sizing so it is tested to fit inside our favorite US-Standard size crib or toddler bed design of your choice. Proudly made in the USA with US and globally sourced materials. We offer a 7 year warranty on this crib mattress on the product's workmanship and materials. The adorable multi-colored heart design is perfect for your little boy or little girl's nursery.